When the phone is in standby the battery drain unexpectedly fast. i get a screen time of only abt 1.5 hours. During the night the battery come down by 25-30%(3g and wifi are both off). I have factory reset the phone but the problem still persists. I have also tried to keep the phone in safe mode when i go to sleep but the battery still drains heavily. The Battery drain in expected amount when i am using the phone. Battery saver apps doesnt seem to help the battery life. Thanx in advance.